[CMake] Wrong flags in fortran project when use c library

[Sebas]

Thanks Kelly by your explication, I learn a lot. With incorporating
"PROPERTIES LINKER_LANGUAGE Fortran" work, without add other thing that
"/NODEFAULTLIB:MSVCRTD.lib" (may be is it related with /MD and /MT?).
For mayor understand, CLibrary in ProgramFortran Directory is for interface
of fortran to CLibrary2 y CPPLibrary2. They are extern librarys that if
posible not modified (SuperLU, tetgen, etc), for it "extern "C"" is
incorporated in CPPLibrary.
In Linux i have to use "TARGET_LINK_LIBRARIES( FortranProgram CLibrary
stdc++ )" for link. Why?
I attach second example if someone want see it.

Bill, create I bug report o not?, with the first example.
With 2.8 rc3 don't work in windows (don't compile test file).

Thanks.

Sebastian

On Fri, Oct 9, 2009 at 7:05 PM, Kelly (KT) Thompson <kt at transpireinc.com>wrote:

> On Fri, Oct 9, 2009 at 12:49 PM, Bill Hoffman <bill.hoffman at kitware.com>wrote:
>
>> Kelly (KT) Thompson wrote:
>>
>>  On Fri, Oct 9, 2009 at 6:15 AM, Sebas <spaseba at gmail.com <mailto:
>>> spaseba at gmail.com>> wrote:
>>>
>>>    I send a example where happen explained before ( I have similar
>>>    struct in my Program). I include too the VS2008 project generate by
>>>    cmake. In the Fortran Project be can seen that use /W3 /Zm1000 /GR
>>>    /RTC1 /TP Flags that don't work with ifort.
>>>    I use CMake 2.8 rc2 (but happen same in 2.6 and 2.7)
>>>
>>>    Thanks.
>>>
>>>    Sebastian
>>>
>>>
>>> Sebastian,
>>>
>>> You are mixing C, C++ and Fortran sources in a single project.  This does
>>> not work well in general and particularly in CMake.  I was able to
>>> restructure your sample code so that it will build with NMake Makefile
>>> (Visual Studio 2008 SP1 and Intel Visual Fortran 11).
>>>
>>> Key points:
>>>
>>> 1. all C++ code goes into a single directory and produces a single
>>> library.  The CMakeLists.txt has the project name CPPLibrary2.
>>>
>>> 2. each C library is built only from C sources. The CMakeLists.txt files
>>> are given the project name CLibrary and CLibrary2.
>>>
>>> 3. the Fortran is also isolated into a single directory and the local
>>> CMakeLists.txt file only deals with the Fortran.
>>>
>>> 4. CMake needs help knowing how to build mixed language targets that must
>>> be compiled with the Fortran compiler.  In the Fortran CMakeLists.txt I had
>>> to set_target properties for LINKER_LANGUAGE.
>>>
>>> 5. When mixing C and Fortran on the Windows platform you must use the
>>> same type of runtime libraries (/MT or /MD).  The default Fortran build uses
>>> /MT, so I had to set these to /MD (Fortran_FLAGS)
>>>
>>> 6. When interfacing C++ and Fortran code, you must mark the C++ function
>>> as extern "C" to avoid name mangling issues.  The Fortran also expects the
>>> C++ symbol name to be all caps.  You can use Fortran's ISO_C_BINDING to get
>>> around this platform issue.
>>>
>>> There are many changes required to your sample build so I decided that a
>>> zip file would be the best way to return the project to you.
>>>
>>>  Thanks for the work around.  However, this should work a bit smoother,
>> Sebastian can you create a bug report and attach your example?
>>
>> Thanks.
>>
>> -Bill
>>
>>
> Bill,
>
> It is my understanding that each CMake target must be 'language pure"  The
> following example will work (and is less complex).  This example assumes
> that all sources are in a single directory (see below).  Because Sebastian
> had separate directories for each language, I assumed that was important for
> his build setup and tried to be faithful to that layout.
>
> I think the key feature that was missing from his original setup was:
>
>   set_target_properties( FortranProgram PROPERTIES LINKER_LANGUAGE Fortran
> )
>
> Without that that statement, CMake will build FortranProgram.obj correctly,
> but then try to generate the .exe by calling the MSVC linker (using the link
> flags for C).
>
> -kt
>
> ## Single directory equivalent CMakeLists.txt:
>
> CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
> PROJECT( FortranProgram C CXX Fortran )
>
> # Find local headers
> INCLUDE_DIRECTORIES( ${PROJECT_SOURCE_DIR} )
>
> # Library CLibrary2
> ADD_LIBRARY( CLibrary2 CLibrary2.c )
>
> # Library CPPLibrary
> ADD_LIBRARY( CPPLibrary2 CPPLibrary2.cpp )
>
> # Library: CLibrary
> ADD_LIBRARY( CLibrary CLibrary.c )
> TARGET_LINK_LIBRARIES( CLibrary CLibrary2 CPPLibrary2 )
>
> # Fortran
> ADD_EXECUTABLE( FortranProgramExe FortranProgram.f90 )
> TARGET_LINK_LIBRARIES( FortranProgramExe CLibrary CLibrary2 CPPLibrary2 )
>
> set(CMAKE_Fortran_FLAGS_DEBUG   "/Od /DDEBUG /MDd" )
> set(CMAKE_Fortran_FLAGS_RELEASE "/O2 /Ob2 /DNDEBUG /MD" )
> set(CMAKE_Fortran_FLAGS_MINSIZEREL "/Os /DNDEBUG /MD" )
> set(CMAKE_Fortran_FLAGS_RELWITHDEBINFO "/O2 /Ob2 /DDEBUG /MD" )
>
> IF( MSVC_IDE )
>   set_target_properties( FortranProgramExe
>     PROPERTIES
>       LINKER_LANGUAGE Fortran
>       LINK_FLAGS "/SUBSYSTEM:CONSOLE"
>       OUTPUT_NAME FortranProgram
>   )
> ELSEIF( WIN32 )
>   set_target_properties( FortranProgramExe
>     PROPERTIES
>       LINKER_LANGUAGE Fortran
>       OUTPUT_NAME FortranProgram
>   )
> ENDIF()
>
>
>
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